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METHOD AND APPARATUS FOR CONTROLLING ION TRAJECTORY PERTURBATIONS IN IONOGRAPHIC DEVICES

IP.com Disclosure Number: IPCOM000026015D
Original Publication Date: 1989-Oct-31
Included in the Prior Art Database: 2004-Apr-05
Document File: 2 page(s) / 81K

Publishing Venue

Xerox Disclosure Journal

Abstract

In an ionogra hic device similar to that described in US Patent 4,644,373 to stream of ions in imagewise fashion towards a moving imaging surface, one or more control electrodes may be arranged adjacent to the ath of the modulated ion stream and between the source of the modulate 2 ion stream and the imaging surface, biased with a voltage, minimizing the effect of charge previously deposited into the image on the imaging surface on the trajectory of subsequently projected ions, to limit the amount of ion beam deflection caused by the presence of electrostatic charge on the imaging surface. The effect of charge previously deposited into the image on the imaging surface on the trajectory of subsequently projected ions, commonly called "blooming" is an undesirable and unavoidable artifact of the ionographic process.

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KEROX DISCLOSURE JOURNAL

METHOD AND APPARATUS FOR CONTROLLING ION TRAJECTORY U.S. C1.346/159
PERTURBATIONS IN IONOGRAPHIC
DEVICES

Proposed Classification

Int. C1. Gold 15/06

Oscar G. Hauser Robert W. Anderson Lawrence M. Hart Steven B. Bolte Raymond W. Stover Frank C. Genovese

In an ionogra hic device similar to that described in US Patent 4,644,373 to

stream of ions in imagewise fashion towards a moving imaging surface, one or more control electrodes may be arranged adjacent to the ath of the modulated ion stream and between the source of the modulate 2 ion stream and the imaging surface, biased with a voltage, minimizing the effect of charge previously deposited into the image on the imaging surface on the trajectory of subsequently projected ions, to limit the amount of ion beam deflection caused by the presence of electrostatic charge on the imaging surface. The effect of charge previously deposited into the image on the imaging surface on the trajectory of subsequently projected ions, commonly called "blooming" is an undesirable and unavoidable artifact of the ionographic process.

There is a strong electric field, limited by air breakdown, between the imaging surface and the control electrode, defined by VE/d, where VE is the bias voltage of the electrode and d is the distance across the air gap from the electrode to the imaging surface. However, the presence of an image on the electroreceptor can deflect the ion beam only to the point where the control elec...